ITU-T G.911 (04 1997) (英) Parameters and calculati

INTERNATIONALTELECOMMUNICATIONUNION)454'TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(04/97)SERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSDigitaltransmissionsystems–Digitalsectionsanddigitallinesystem–Parametersforopticalfibrecablesystems0ARAMETERSANDCALCULATIONMETHODOLOGIESFORRELIABILITYANDAVAILABILITYOFFIBREOPTICSYSTEMSITU-TRecommendationG.911(PreviouslyCCITTRecommendation)ITU-TG-SERIESRECOMMENDATIONS42!.3-)33)/.3934%-3!.$-%$)!$)')4!,3934%-3!.$.%47/2+3Forfurtherdetails,pleaserefertoITU-TListofRecommendations.INTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199).4%2.!4)/.!,!.!,/'5%#!22)%23934%-GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-TRANSMISSIONSYSTEMSG.200–G.299INDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONMETALLICLINESG.300–G.399GENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESG.400–G.449COORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.49942!.3-)33)/.-%$)!#(!2!#4%2)34)#3G.600–G.699$)')4!,42!.3-)33)/.3934%-3TERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999GeneralG.900–G.9090ARAMETERSFOROPTICALFIBRECABLESYSTEMS''Digitalsectionsathierarchicalbitratesbasedonabitrateof2048kbit/sG.920–G.929Digitallinetransmissionsystemsoncableatnon-hierarchicalbitratesG.930–G.939DigitallinesystemsprovidedbyFDMtransmissionbearersG.940–G.949DigitallinesystemsG.950–G.959DigitalsectionanddigitaltransmissionsystemsforcustomeraccesstoISDNG.960–G.969OpticalfibresubmarinecablesystemsG.970–G.979OpticallinesystemsforlocalandaccessnetworksG.980–G.999ITU-TRECOMMENDATIONG.911PARAMETERSANDCALCULATIONMETHODOLOGIESFORRELIABILITYANDAVAILABILITYOFFIBREOPTICSYSTEMSSummaryThisRecommendationidentifiesaminimumsetofparametersnecessarytocharacterizethereliabilityandavailabilityoffibreopticsystems.Differentparametersaregivenforsystemreliabilityandmaintenance,foractiveopticdevicereliability,forpassiveopticaldevicereliability,andforopticalfibreandcablereliability.ThisRecommendationalsoprovidesguidelinesandmethodsforcalculatingthepredictedreliabilityofdevices,unitsandsystems.Examplesareincluded.SourceITU-TRecommendationG.911wasrevisedbyITU-TStudyGroup15(1997-2000)andwasapprovedundertheWTSCResolutionNo.1procedureonthe8thofApril1997.iiRecommendationG.911(04/97)FOREWORDITU(InternationalTelecommunicationUnion)istheUnitedNationsSpecializedAgencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganoftheITU.TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1.InsomeareasofinformationtechnologywhichfallwithinITU-T’spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.INTELLECTUALPROPERTYRIGHTSTheITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.TheITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,theITUhad/hadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.ªITU1997Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationG.911(04/97)iiiCONTENTSPage1Introduction.................................................................................................................12Parametersrelatedtoreliabilityandavailabilityoffibreopticsystems.....................12.1Fibreopticsystemavailabilityandmaintenancereliability-relatedparameters.........12.2Activeopticaldevicereliabilityparameters................................................................22.3Passiveopticaldevicereliabilityparameters..............................................................22.4Opticalfibreandcablereliabilityparameters.............................................................33Definitions..................................................................................................................34Steady-statereliabilitypredictionmethodofdevices,unitsandfibreopticsystemsinserialconfiguration...